Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555702c03bc5e39…

MALICIOUS

PDF

66.8 KB Created: 2021-09-07 13:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a4a612b14a98c8b47a246e7f895b376 SHA-1: c9edf778c25cea75cf440a2fba814fca1ee008e4 SHA-256: c555702c03bc5e39ab8c5e915d037b50e20293c06fead31914d62b84d25f0bbb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dogoducthien.com/uploads/files/sokuwebarag.pdf In PDF document text
    • http://amexeuro.com/an3_Uploads/file/22853707580.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc258f176b---kexudufavarulefurewer.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f000e0605---jimaxefiwegodobunefolek.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/82666132795.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/14e3f6b5d745a9a27beb70e98e62e507/romev.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/be519902326a8765a92b4159525d4bb3/13290161810.pdfIn PDF document text
    • http://sun-tes.ru/files/file/fiweketulupimaguwikidagam.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f906e3eb060---4208432170.pdfIn PDF document text
    • http://strandedtattoo.net/file/vokotuvasal.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14bf3d1269---68014753739.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/73472670223.pdfIn PDF document text
    • https://ivanamihic.com//files/xupavamugirino.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rpm2ar4gophl4uu4b0pkil4t30/80631198159.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/41287319567.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21a2210c2---paxoxesuxaxulufetanedarin.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/laxamivarabiwalugiza.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f2b9257d8de4530eb4e660f111a9088/34224079018.pdfIn PDF document text
    • http://intergeored.com/upload/File/19420414968.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbed0c48856---pujazu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608babe4f3651---jitagetiw.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/68815956115.pdfIn PDF document text
    • http://millecolori.it/images/file/firasekekulumu.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/94944095350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=klasifikasi+rhizopus+sp+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 18744 bytes
SHA-256: 6de548c988cd709f0d6b6812ca41fd871f6577b4a82078ed5adf00617fe49547

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